#!/usr/bin/python3

# This file is part of Cockpit.
#
# Copyright (C) 2015 Red Hat, Inc.
#
# Cockpit is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# Cockpit is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Cockpit; If not, see <http://www.gnu.org/licenses/>.

import parent
from storagelib import *
from testlib import *


@skipImage("UDisks doesn't have support for multipath", "debian-stable", "debian-testing", "ubuntu-2004", "ubuntu-stable", "arch")
class TestStorageMultipath(StorageCase):

    def testBasic(self):
        m = self.machine
        b = self.browser

        def detail_row_name(index):
            return f'#detail-header .pf-c-description-list__group:nth-of-type({index}) > dt'

        def detail_row_value(index):
            return f'#detail-header .pf-c-description-list__group:nth-of-type({index}) > dd'

        def wait_detail_row(index, name):
            b.wait_visible(detail_row_name(index))
            b.wait_text(detail_row_name(index), name)

        def check_free_block_devices(expected):
            blocks = b.eval_js("ph_texts('#dialog [data-field=\"disks\"] .checkbox')")
            if len(blocks) != len(expected):
                return False
            for i in range(len(expected)):
                if not expected[i] in blocks[i]:
                    return False
            return True

        # At least on Fedora 27, multipath only looks at SCSI_IDENT_
        # and ID_WWN properties, so we install a custom udev rule to
        # set ID_WWN to something that can identify multipathed devices.
        #
        m.write("/etc/udev/rules.d/99-fake-wwn.rules", 'SUBSYSTEM=="block", ENV{ID_WWN}="$env{ID_SCSI_SERIAL}"\n')
        m.execute("udevadm control --reload")
        m.execute("udevadm trigger")

        self.login_and_go("/storage")

        b.inject_js("""
          ph_texts = function (sel) {
            return ph_select(sel).map(function (e) { return e.textContent });
          }""")

        # Add a disk
        m.add_disk("10M", serial="MYSERIAL")

        b.wait_in_text("#drives", "MYSERIAL")
        b.click('.sidepanel-row:contains("MYSERIAL")')
        b.wait_visible('#storage-detail')
        wait_detail_row(5, "Device file")
        b.wait_in_text(detail_row_value(5), "/dev/sda")

        # Add another disk with the same serial, which fools
        # multipathd into treating it as another path to the first
        # disk.  Since we never actually write to it, this is fine.

        # The primary device file should disappear and multipathed
        # devices should be listed.
        m.add_disk("10M", serial="MYSERIAL")
        b.wait_text_not(detail_row_value(5), "/dev/sda")
        wait_detail_row(6, "Multipathed devices")
        b.wait_in_text(detail_row_value(6), "/dev/sda")
        b.wait_in_text(detail_row_value(6), "/dev/sdb")

        # Check that neither is offered as a free block device
        b.go("#/")
        self.devices_dropdown('Create LVM2 volume group')
        self.dialog_wait_open()
        check_free_block_devices([])
        self.dialog_cancel()
        self.dialog_wait_close()

        b.go("#/sda")
        b.wait_visible('#storage-detail')

        # Switch on multipathd.  A primary device should appear.

        b.wait_visible('.pf-m-danger:contains(There are devices with multiple paths on the system, but)')
        b.click('button:contains(Start multipath)')
        b.wait_in_text(detail_row_value(5), "/dev/mapper/mpatha")
        b.wait_not_present('.pf-m-danger:contains(There are devices with multiple paths on the system, but)')

        # Check that (exactly) the primary device is offered as free
        b.go("#/")
        self.devices_dropdown('Create LVM2 volume group')
        self.dialog_wait_open()
        check_free_block_devices(["/dev/mapper/mpatha"])
        self.dialog_cancel()
        self.dialog_wait_close()


if __name__ == '__main__':
    test_main()
